Originally Posted by Grampy™
Change a tire a few times at home. Don't let a flat tire be your first experience of changing a tire. If you have problems have you local Bike Shop (LBS) show you how.
Good advice, roadside is not the place to learn.
Carry the appropriate gear with you to change the flat too. I carry an extra inner tube and a repair kit. I replace the bad innertube so I'm riding on a good tube and fix the other one before I get going. That way when you get your next flat, for some reason they seem to come in pairs for me, you have another tube ready. I also carry a tire tool to remove the tire and a gerber multi-tool in case something else comes up with the bike.
Dave